Caitlin Clark keeps rewriting the record books -- her one-of-one, autographed logo patch rookie card just sold at auction for $660k ... making it the most expensive in women's sports!!
The gem was sold through Fanatics Collect's July Premier auction on Thursday ... and a lucky bidder got their hands on Clark's 2024 Panini Flawless WNBA Platinum card after shelling out the eye-popping amount of dough.
So, why back up the Brinks trucks for a piece of cardboard?